GRE Math : How to find x or y intercept
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Example Questions
Example Question #1 : X And Y Intercept
What is the y-intercept of the line that goes through the points (–2, 1) and (5, 6)?
17/7
The answer cannot be determined from the given information.
–2/7
67/7
0
17/7
The slope can be calculated from m = (y2 – y1)/(x2 – x1) = (6 – 1)/(5 + 2). Having calculated the slope, we can now use point-slope form of a line, y – y1 = m(x – x1), and using the second point (5, 6): y – 6 = (5/7)(x – 5). This can be rearranged into slope-intercept form to obtain: y = (5/7)x + (17/7). Because the equation is now in slope intercept form, we know that the y-intercept is 17/7.
Example Question #2 : X And Y Intercept
Find the x-intercept of the equation
–10
10
0
2
–2
10
The answer is 10.
In order to find the x-intercept we simply let all the y's equal 0
Example Question #301 : Geometry
Quantity A:
The 
Quantity B:
The 
The relationship cannot be determined from the information given.
Quantity B is greater
Quantity A is greater
The two quantities are equal.
The two quantities are equal.
The key to these quantitative comparison problems is to figure out the worth of both quantities, or figure out whether evaluating the quantities is even possible. In this case, evaluating the quantities is a fairly straightforward case of figuring out the intercepts of two different lines, which is possible. Therefore, you can already discount "the relationship cannot be determined from the information given".
To solve quantity A: 
To solve quantity B: 
Both quantity A and quantity B 
Example Question #2 : X And Y Intercept
What is the 
To find the 
This leaves you with
Then you must get you by itself so you add 
Then divide both sides by 
For the coordinate point, 
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